Cidrize

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- Reworked the way bracket parsing works; removed PyParsing as a dependency
(too slow)
- Broke hyphenated (4th octect only) parsing into its own function

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- Fixed a bug in cidrize() when hostnames were passed in. Now explicitly
checking for hostnames and raising an exception.
- Added a test for this.

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- Added a feature to parse a comma-separted input string. New parse_commas()
function to do this.
- Modified most parsing methods to accept strict vs. loose parsing except where
it doesn't make sense (e.g. CIDR will always be strict).
- Added optimize_network_range() to do exactly that based on a specified usage
ratio.

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- Re-arranged parsing order inside of cidrize(); will now parse EVERYTHING FIRST.
- Added '0.0.0.0-255.255.255.255' to EVERYTHING

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- Added normalize_address() to cleanup non-standard IP strings (e.g. unicode).
- Added normalize_address to __all__.
- Added netaddr_to_ipy() to turn a list of netaddr objects into IPy objects.
- cidrize() can now translate keywords such as "any" or "internet" into 0.0.0.0/0.
- cidrize() now defaults to loose parsing & will return a spanning CIDR; you may
negate this behavior by passing strict=True.

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- Added unittests, however weak they may be.